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Roy S, Mohanty M, Miller RG, Patra SA, Lima S, Banerjee A, Metzler-Nolte N, Sinn E, Kaminsky W, Dinda R. Probing CO Generation through Metal-Assisted Alcohol Dehydrogenation in Metal-2-(arylazo)phenol Complexes Using Isotopic Labeling (Metal = Ru, Ir): Synthesis, Characterization, and Cytotoxicity Studies. Inorg Chem 2020; 59:15526-15540. [PMID: 32993294 DOI: 10.1021/acs.inorgchem.0c02563] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The reaction of 2-{2-(benzo[1,3]dioxol-5-yl)- diazo}-4-methylphenol (HL) with [Ru(PPh3)3Cl2] in ethanol resulted in the carbonylated ruthenium complex [RuL(PPh3)2(CO)] (1), wherein metal-assisted decarbonylation via in situ ethanol dehydrogenation is observed. When the reaction was performed in acetonitrile, however, the complex [RuL(PPh3)2(CH3CN)] (2) was obtained as the main product, probably by trapping of a common intermediate through coordination of CH3CN to the Ru(II) center. The analogous reaction of HL with [Ir(PPh3)3Cl] in ethanol did not result in ethanol decarbonylation and instead gave the organoiridium hydride complex [IrL(PPh3)2(H)] (3). Unambiguous evidence for the generation of CO via ruthenium-assisted ethanol oxidation is provided by the synthesis of the 13C-labeled complex, [Ru(PPh3)2L(13CO)] (1A) using isotopically labeled ethanol, CH313CH2OH. To summarize all the evidence, a ruthenium-assisted mechanistic pathway for the decarbonylation and generation of alkane via alcohol dehydrogenation is proposed. In addition, the in vitro antiproliferative activity of complexes 1-3 was tested against human cervical (HeLa) and human colorectal adenocarcinoma (HT-29) cell lines. Complexes 1-3 showed impressive cytotoxicity against both HeLa (half-maximal inhibitory concentration (IC50) value of 3.84-4.22 μM) and HT-29 cancer cells (IC50 values between 3.3 and 4.5 μM). Moreover, the complexes were comparatively less toxic to noncancerous NIH-3T3 cells.
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Affiliation(s)
- Satabdi Roy
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Monalisa Mohanty
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Reece G Miller
- Department of Chemistry and Biochemistry, Ruhr University Bochum, Universitaetsstrasse 150, Bochum 44801, Germany
| | - Sushree Aradhana Patra
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Sudhir Lima
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Atanu Banerjee
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Nils Metzler-Nolte
- Department of Chemistry and Biochemistry, Ruhr University Bochum, Universitaetsstrasse 150, Bochum 44801, Germany
| | - Ekkehard Sinn
- Department of Chemistry, Western Michigan University, Kalamazoo 49008, Michigan, United States
| | - Werner Kaminsky
- Department of Chemistry, University of Washington, Seattle 98195, Washington, United States
| | - Rupam Dinda
- Department of Chemistry, National Institute of Technology, Rourkela 769008, Odisha, India
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Xue M, Xiong CF, Mo XF, Li H, Yi XY. The synthesis and characterization of an ortho-metallated iridium(III) hydride based on a pyridylpyrrole ligand. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114515] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Henwood AF, Hu Y, Sajjad MT, Thalluri GKVV, Ghosh SS, Cordes DB, Slawin AMZ, Samuel IDW, Robertson N, Zysman-Colman E. Unprecedented Strong Panchromic Absorption from Proton-Switchable Iridium(III) Azoimidazolate Complexes. Chemistry 2015; 21:19128-35. [PMID: 26567486 DOI: 10.1002/chem.201503546] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Indexed: 11/11/2022]
Abstract
Two new heteroleptic iridium(III) complexes bearing an aryldiazoimidazole ligand are reported. These complexes differ structurally with respect to the protonation state of the imidazole ring, but can be independently accessed by varying the synthetic conditions. Their structures have been unequivocally confirmed by X-ray crystal structure analysis, with surprising differences in the structural parameters of the two complexes. The strongly absorbing nature of the free diazoimidazole ligand is enhanced in these iridium complexes, with the protonated cationic complex demonstrating extraordinarily strong panchromic absorption up to 700 nm. The absorption profile of the deprotonated neutral complex is blueshifted by about 100 nm and thus the interconversion between the two complexes as a function of the acidity/basicity of the environment can be readily monitored by absorption spectroscopy. Theoretical calculations revealed the origins of these markedly different absorption properties. Finally, the protonated analogue has been targeted as an acceptor material for organic photovoltaic (OPV) applications, and preliminary results are reported.
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Affiliation(s)
- Adam F Henwood
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST (UK), Fax: (+44) 1334-463808 URL:http://www.zysman-colman.com
| | - Yue Hu
- EaStCHEM School of Chemistry, University of Edinburgh, King's Buildings, Edinburgh EH93FJ (UK)
| | - Muhammad T Sajjad
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife, KY16 9SS (UK)
| | - Gopala K V V Thalluri
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife, KY16 9SS (UK)
| | - Sanjay S Ghosh
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife, KY16 9SS (UK).,Current address: Optoelectronics Laboratory, Department of Physics, North Maharashtra University, Jalgaon-425001 (India)
| | - David B Cordes
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST (UK), Fax: (+44) 1334-463808 URL:http://www.zysman-colman.com
| | - Alexandra M Z Slawin
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST (UK), Fax: (+44) 1334-463808 URL:http://www.zysman-colman.com
| | - Ifor D W Samuel
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife, KY16 9SS (UK)
| | - Neil Robertson
- EaStCHEM School of Chemistry, University of Edinburgh, King's Buildings, Edinburgh EH93FJ (UK)
| | - Eli Zysman-Colman
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST (UK), Fax: (+44) 1334-463808 URL:http://www.zysman-colman.com.
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